Hmmm, not familiar with Creed cartridge....but for 90g and above bullet weight I use N140 in the BR....If I were you I wouldn't faf around swapping and changing bullets just yet, especially if you have a decent supply of them - persevere, but try N140 instead of 150 ....
What pissed me off about it is my group with the 103g ELD-X only came together after 2 boxes of load development, thereby I believed I had forked out hard earned cash for a bullet that I thought wasn't going to work, (whereas I can usually find the node in half a box) - not so with the ELD-X 😟...I bought them only because I couldn't get hold of the 95g SMK
It took a while to get there, 230 odd rounds or so, and playing with seating-depth - so yes, I did find the ELD-X finicky, extremely so - no pun intended
Pointless me listing the actual seating-depth etc...but, my charge in a 6BR is - 27.2g of N140
Persevere, and give the barrel (and yourself) a chance
ATB